Should you take your MacBook for repair if there is not a serious problem, but there is no way to solve it yourself? Can't Apple support help with this?

Yes, Apple support can help you with this, but many users don’t even know about many features of Mac and Apple gadgets, so I would just look for good information channels like https://setapp.com/how-to/right-click-on-a-mac which will help you become a more productive user of Apple gadgets. There is a lot of useful information here, even on how to solve simple problems.